[belorn]

> Testosterone is linked with higher levels of aggression.

Testosterone is correlated to higher levels of aggression similar to how estrogen is correlated to emotional instability. It leads to false and rather crappy conclusions which misrepresent what hormones actually does to the human mind.

Modern research on testosterone show that higher levels increase the response that a man or woman has when their social status is challenged. If social status is maintained in a group through violence and aggression then those correlate to testosterone, but you can as easily have a company where productivity is the primary trait for social status and then testosterone levels will correlate to productivity when someone have their social status challenged.

From a biological perspective, this has a very basic reason. Testosterone goes up when the chance for procreation is high and it can be seen as a modulating effect that encourage the individual to hold on to the current beneficial social status. Aggression in itself is not an effective strategy for that goal and is only relevant if the local culture reward aggression.